Transue-Lecture4

Transue-Lecture4 - Circular area , z-line, structure in the...

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Circular area , z-line, structure in the middle, which is n-line myson filament extends to other side The arrangement of thick and thin myofilmanets form light and dark alternationg bands (striations) o Thin filaments (light) ; actin (z-line runs through middle of it) o Thick filaments (myosin) o H-zone is somewhat lighter area in middle o Either one contract during a sarcomere contraction Sarcomere cx o One myosin is going ot interact with multiple actins (thin filaments) fig 38-8a p 737 How does a muscle contract? o Or…How does a sarcomere shorten o Sliding filament model Fibers slide so area of thin and thick filament overlap increases Filament size does not change! o By do filaments slide? Use fig 38-10 p738 ADAM – sliding filament theory Myosin action Low energy conformation – High energy when ATP binds Myson gets close to actin and binds to actin o Actin’s Role: Tropomyosin – long filamentous protein, lying over the binding site that
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This note was uploaded on 04/08/2011 for the course BIOLOGY 109:102 taught by Professor Martin during the Spring '11 term at Rutgers.

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Transue-Lecture4 - Circular area , z-line, structure in the...

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